19495142189 has 2 divisors, whose sum is σ = 19495142190. Its totient is φ = 19495142188.

The previous prime is 19495142167. The next prime is 19495142213. The reversal of 19495142189 is 98124159491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17393653225 + 2101488964 = 131885^2 + 45842^2 .

It is a cyclic number.

It is not a de Polignac number, because 19495142189 - 2⁸ = 19495141933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19495142189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19495162189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9747571094 + 9747571095.

It is an arithmetic number, because the mean of its divisors is an integer number (9747571095).

Almost surely, 2^19495142189 is an apocalyptic number.

It is an amenable number.

19495142189 is a deficient number, since it is larger than the sum of its proper divisors (1).

19495142189 is an equidigital number, since it uses as much as digits as its factorization.

19495142189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 53.

The spelling of 19495142189 in words is "nineteen billion, four hundred ninety-five million, one hundred forty-two thousand, one hundred eighty-nine".